Alaikumassalam wa rahmatullah,
Inara or Inarah means “lighting”, “illumination”, literally meanin “to light”, “to illuminate”, and the meaning of “street lamp” comes from that. It is not a bad meaning in its own.
It is important to take culture and the preference of the locals into consideration, if the local Arabs think it is not an admirable name and the child lives among Arabs or is going to, then may be best to avoid, even though many Muslim non-Arab cultures like the name and use it.
There is also the name Misbah which means “lamp”, “light”, which is actually a common name among Arabs, though it is used with the meaning of “light bulb” too.